Valley of the River Kent; lake
Kendalyn is a modern American invention, likely created by combining the English surname Kendal with the popular suffix -lyn. Kendal itself refers to the Kent Valley in England, while the -lyn suffix is often associated with the Welsh word for lake.
Less common today
Kendalyn isn't in the latest US Top 1000. It last peaked at #2,821 in 2014.
US births per 5-year period, 1990βpresent (SSA data).